Variable-capacity compressor control valve

Abstract

Provided is a variable-capacity compressor control valve with a simple configuration that can increase the attraction force of an electromagnetic actuator and thus can reduce the size of the control valve. A sub valve element that is a magnetic body made of the same magnetic material as or a different magnetic material from that of a plunger, which is adapted to move a main valve element in the direction to open or close the valve orifice, is fitted in and fixed to the plunger.

The invention claimed is: 
     
       1. A variable-capacity compressor control valve comprising:
 a valve body including a valve chamber with a valve orifice, a Ps inlet/outlet port communicating with a suction chamber of a compressor, a Pd introduction port arranged upstream of the valve orifice and communicating with a discharge chamber of the compressor, and a Pc inlet/outlet port arranged downstream of the valve orifice and communicating with a crank chamber of the compressor; 
 a main valve element adapted to open or close the valve orifice; 
 an electromagnetic actuator including a plunger and an attractor, the electromagnetic actuator being adapted to move the main valve element in a direction to open or close the valve orifice; 
 a pressure-sensitive chamber adapted to receive a suction pressure Ps from the compressor via the Ps inlet/outlet port; and 
 a pressure-sensitive reaction member adapted to urge the main valve element in the direction to open or close the valve orifice in accordance with a pressure in the pressure-sensitive chamber, 
 wherein: 
 the main valve element includes an in-valve release passage for releasing a pressure Pc in the crank chamber to the suction chamber of the compressor via the Ps inlet/outlet port, 
 a sub valve element adapted to open or close the in-valve release passage is provided, 
 the plunger has a cylindrical shape, and 
 a magnetic body made of the same magnetic material as or a different magnetic material from that of the plunger is securely inserted in the plunger in order to increase an attraction force of the electromagnetic actuator. 
 
     
     
       2. The variable-capacity compressor control valve according to  claim 1 , wherein the magnetic body is a cylindrical member. 
     
     
       3. The variable-capacity compressor control valve according to  claim 1 , wherein the magnetic body is press-fitted in and fixed to the plunger. 
     
     
       4. The variable-capacity compressor control valve according to  claim 1 , wherein a projected area of a lower face of the attractor with respect to a horizontal plane is equal to a projected area of upper faces of the magnetic body and the plunger with respect to the horizontal plane.